Granted Patent
Utility
US 5,152,412 · App. 07/553,649
Tamper evident closure using microcapsules
Inventor:
Howard D. Iler
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Jul 18, 1990
Inventor
Howard D. Iler
Assignee (at issue)
Continental White Cap, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.